微波加热辅助多孔介质水合物制样方法与装置

Sample preparation method and apparatus of porous medium hydrate based on microwave heating

针对多孔介质中人工合成水合物分布不均匀问题,提出采用微波加热法制备多孔介质水合物样品的新途径,并设计了专用微波加热装置。基于电磁场理论及微波加热均匀性影响因素分析,设计了多馈源可调式波导加热系统。通过数值模拟和加热试验分析馈能口与样品间相对位置变化对装置加热均匀性影响,探讨该装置用于水合物样品制备的可行性。结果表明:装置加热均匀性受馈能口与样品间相对位置影响较大,其加热均匀性随二者间距的增加而显著提高,数值模拟与试验结果取得了较好的一致性;加热时间对装置的加热均匀性影响较小,该微波加热装置可满足制备均匀分布水合物样品的要求,同时对于其他对加热均匀性有一定要求的试验装置的设计具有参考意义。

For the problem of uneven distribution of gas hydrate synthesized in porous media, a new method for obtaining hydrate samples in porous media by microwave heating was proposed and a microwave heating apparatus was designed for this method. Based on the electromagnetic theory and the influencing factors of microwave heating uniformity, the adjustable multi-feeding microwave heating system was created. Numerical simulation and relevant heating test were made to analyze the effects of relative positions of the waveguides and specimen on apparatus heating uniformity, by which the feasibility of the apparatus to prepare gas hydrate synthesis was discussed. The results show that the heating uniformity is greatly affected by the variation of distance between the waveguides and specimen and it gets better with distance significantly. The consequence of numerical simulation is consistent with the result of experiment. The heating uniformity of the apparatus is less affected by heating time and the apparatus can meet the requirement of hydrates synthesis in uniformity, and its design may provide certain reference significance for the design of testing devices with some requirements in heating uniformity.